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UNITED STATES PATENT OFFICE.

ROBERT W. DAVIS, OF ELMIRA, NEW YORK, ASSIGNOR TO THE O-ARBONATE MINING COMPANY, OF SAME PLACE.

COMMERCIAL PUTTY.

SPECIFICATION forming part of Letters Patent No. 271,973, dated February 6, 1883.

Application filed October-3,1882. (No specimens.)

To all whom it may concern:

Be it known that I, ROBERT W. DAvIs, a citizen of the United States, residing atElmira, in the county of Oheinung and State of New York, have invented certain new and useful Improvements in Commercial Putty, and I do hereby declare that the following is a full, clear, and exact description of the same.

The present invention relates to the man ufacture of commercial putty; and the object thereof is to produce such an article at a less .cost and specific gravity thanthe putty in common use, and in all respects equal, for the purpose for which it is used, to the putty of ordinary manufacture from chalk or common whiting. I

The invention consists in the employment of fossil shells, commonly known. as shellmarl, which, after being thoroughly dried, is reduced to an impalpable powder and mixed, with proper proportions of oil, to such a consistence as will work into putty when the mass is operated upon by the usual machinery employed in the manufacture of the ordinary commercial putty now in common use.

In carrying out my invention I take the shell-marl in its crude state, without burning it, and when sufficiently dry it is reduced by suitable machinery to an impalpable powder, and then mix it with a suitable quantity of oil to make a thick paste, after which the usual machinery is employed for working it as is used in the manufacture of the ordinary putty. I prefer, however/to use equal parts or nearly equal parts ofparaffine-oil and. a vegetable oil, preferably linseed-oil, with aboutfour times the quantity of powdered shell-marl. I desire, however, that it be understood that fossil shell, commonly known as shell-marl, is the principal ingredient of the putty, and in which my invention solely consists, and therefore do not confine myself to the oils hereinbefore specified, so long as the article shell-marl is used in the production of a commercial putty, thereby enabling a first-class article to be produced at a less cost, and superior quality, than the orof a light nature and readily obtained in large quantities at a comparatively small cost. Having now fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

A putty composed of shell-marl and oil, substantially as and for the purpose set forth.

hereunto subscribed my name in the presence of two Witnesses.

ROBERT W. DAVIS.

Witnesses J OHN N. COOPER, GHAs. G. LAPPE.

In testimony that I claim the above I have i dinary putty in common use, as the shell-marl 

